It depends on how you look at it. If a person can't access a Dolphin site via a cell phone app, they are not likely to get very involved with that site by accessing it via a cell phone web browser. Everybody likes to talk about the high percentage of users that access websites via a mobile phone. For the most part, that means Facebook. I seriously doubt that a very high percentage use the cell phones web browser to interact with FB... the last time I checked, it was an extremely annoying experience. see more Mobile apps can interact with the cell phone file system more efficiently than web browsers ever will. Until the Dolphin mobile app takes on a lot more sophistication and polish, cell phone users aren't going to think much of your sites usability, and all you "responsive" experts are pissing into the wind.